The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-9090, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-494-9090 |
| Primary Part Number | ST3M652C6-15D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Fastener Length | 1.542 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST3M652C6-15D PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M652C6-15D | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M652C6-15D | Howmet Global Fastening Systems Inc (USA) |
| HT4020-6-15 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C6-15D | West Coast Aerospace, Inc. (USA) |
| HT4020-6-15 PRIMARY | Huck International, Inc (USA) |
| HT4020-6-15 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-6-15 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-15 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-15 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-15 | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-15 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-494-9090 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-9090 has 8 manufacturer part numbers on file: ST3M652C6-15D (The Boeing Company Div Defense), ST3M652C6-15D (Fastener Innovation Technology, Inc. Dba F I T), ST3M652C6-15D (Howmet Global Fastening Systems Inc), HT4020-6-15 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M652C6-15D (West Coast Aerospace, Inc.) and 3 more.
Key specifications for ST3M652C6-15D: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Fastener Length: 1.542 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN. 20 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.